![Bill Meier](/assets/img/avatar_default.png)
Change-Id: Ia6c3e7a25615bf8e052c3bacf096d76df775c9c2 Reviewed-on: https://code.wireshark.org/review/4126 Reviewed-by: Bill Meier <wmeier@newsguy.com>
405 lines
11 KiB
C
405 lines
11 KiB
C
/* frame_data.c
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* Routines for packet disassembly
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/epan.h>
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#include <wiretap/wtap.h>
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#include <epan/frame_data.h>
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/wmem/wmem.h>
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#include <epan/timestamp.h>
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#include <epan/packet_info.h>
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/* Protocol-specific data attached to a frame_data structure - protocol
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index and opaque pointer. */
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typedef struct _frame_proto_data {
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int proto;
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guint32 key;
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void *proto_data;
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} frame_proto_data;
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/* XXX - I declared this static, because it only seems to be used by
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* p_get_proto_data and p_add_proto_data
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*/
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static gint
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p_compare(gconstpointer a, gconstpointer b)
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{
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const frame_proto_data *ap = (const frame_proto_data *)a;
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const frame_proto_data *bp = (const frame_proto_data *)b;
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if (ap -> proto > bp -> proto){
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return 1;
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}else if (ap -> proto == bp -> proto){
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if (ap -> key > bp -> key){
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return 1;
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}else if (ap -> key == bp -> key){
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return 0;
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}
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return -1;
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}else{
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return -1;
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}
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}
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void
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p_add_proto_data(wmem_allocator_t *tmp_scope, struct _packet_info* pinfo, int proto, guint32 key, void *proto_data)
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{
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frame_proto_data *p1;
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GSList** proto_list;
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wmem_allocator_t *scope;
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if (tmp_scope == pinfo->pool) {
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scope = tmp_scope;
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proto_list = &pinfo->proto_data;
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} else {
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scope = wmem_file_scope();
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proto_list = &pinfo->fd->pfd;
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}
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p1 = (frame_proto_data *)wmem_alloc(scope, sizeof(frame_proto_data));
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p1->proto = proto;
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p1->key = key;
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p1->proto_data = proto_data;
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/* Add it to the GSLIST */
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*proto_list = g_slist_prepend(*proto_list,
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(gpointer *)p1);
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}
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void *
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p_get_proto_data(wmem_allocator_t *scope, struct _packet_info* pinfo, int proto, guint32 key)
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{
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frame_proto_data temp, *p1;
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GSList *item;
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temp.proto = proto;
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temp.key = key;
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temp.proto_data = NULL;
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if (scope == pinfo->pool) {
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item = g_slist_find_custom(pinfo->proto_data, (gpointer *)&temp, p_compare);
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} else {
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item = g_slist_find_custom(pinfo->fd->pfd, (gpointer *)&temp, p_compare);
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}
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if (item) {
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p1 = (frame_proto_data *)item->data;
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return p1->proto_data;
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}
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return NULL;
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}
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void
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p_remove_proto_data(wmem_allocator_t *scope, struct _packet_info* pinfo, int proto, guint32 key)
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{
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frame_proto_data temp;
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GSList *item;
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GSList** proto_list;
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temp.proto = proto;
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temp.key = key;
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temp.proto_data = NULL;
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if (scope == pinfo->pool) {
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item = g_slist_find_custom(pinfo->fd->pfd, (gpointer *)&temp, p_compare);
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proto_list = &pinfo->proto_data;
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} else {
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item = g_slist_find_custom(pinfo->fd->pfd, (gpointer *)&temp, p_compare);
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proto_list = &pinfo->fd->pfd;
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}
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if (item) {
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*proto_list = g_slist_remove(*proto_list, item->data);
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}
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}
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gchar *
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p_get_proto_name_and_key(wmem_allocator_t *scope, struct _packet_info* pinfo, guint pfd_index){
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frame_proto_data *temp;
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if (scope == pinfo->pool) {
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temp = (frame_proto_data*)g_slist_nth_data(pinfo->proto_data, pfd_index);
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} else {
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temp = (frame_proto_data*)g_slist_nth_data(pinfo->fd->pfd, pfd_index);
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}
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return wmem_strdup_printf(wmem_packet_scope(),"[%s, key %u]",proto_get_protocol_name(temp->proto), temp->key);
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}
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#define COMPARE_FRAME_NUM() ((fdata1->num < fdata2->num) ? -1 : \
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(fdata1->num > fdata2->num) ? 1 : \
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0)
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#define COMPARE_NUM(f) ((fdata1->f < fdata2->f) ? -1 : \
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(fdata1->f > fdata2->f) ? 1 : \
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COMPARE_FRAME_NUM())
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/* Compare time stamps.
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A packet whose time is a reference time is considered to have
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a lower time stamp than any frame with a non-reference time;
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if both packets' times are reference times, we compare the
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times of the packets. */
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#define COMPARE_TS_REAL(time1, time2) \
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((fdata1->flags.ref_time && !fdata2->flags.ref_time) ? -1 : \
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(!fdata1->flags.ref_time && fdata2->flags.ref_time) ? 1 : \
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((time1).secs < (time2).secs) ? -1 : \
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((time1).secs > (time2).secs) ? 1 : \
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((time1).nsecs < (time2).nsecs) ? -1 :\
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((time1).nsecs > (time2).nsecs) ? 1 : \
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COMPARE_FRAME_NUM())
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#define COMPARE_TS(ts) COMPARE_TS_REAL(fdata1->ts, fdata2->ts)
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void
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frame_delta_abs_time(const struct epan_session *epan, const frame_data *fdata, guint32 prev_num, nstime_t *delta)
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{
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const nstime_t *prev_abs_ts = (prev_num) ? epan_get_frame_ts(epan, prev_num) : NULL;
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if (prev_abs_ts) {
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nstime_delta(delta, &fdata->abs_ts, prev_abs_ts);
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} else {
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/* If we don't have the time stamp of the previous packet,
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it's because we have no displayed/captured packets prior to this.
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Set the delta time to zero. */
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nstime_set_zero(delta);
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}
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}
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static gint
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frame_data_time_delta_compare(const struct epan_session *epan, const frame_data *fdata1, const frame_data *fdata2)
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{
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nstime_t del_cap_ts1, del_cap_ts2;
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frame_delta_abs_time(epan, fdata1, fdata1->num - 1, &del_cap_ts1);
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frame_delta_abs_time(epan, fdata2, fdata2->num - 1, &del_cap_ts2);
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return COMPARE_TS_REAL(del_cap_ts1, del_cap_ts2);
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}
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static gint
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frame_data_time_delta_rel_compare(const struct epan_session *epan, const frame_data *fdata1, const frame_data *fdata2)
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{
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nstime_t del_rel_ts1, del_rel_ts2;
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frame_delta_abs_time(epan, fdata1, fdata1->frame_ref_num, &del_rel_ts1);
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frame_delta_abs_time(epan, fdata2, fdata2->frame_ref_num, &del_rel_ts2);
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return COMPARE_TS_REAL(del_rel_ts1, del_rel_ts2);
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}
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static gint
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frame_data_time_delta_dis_compare(const struct epan_session *epan, const frame_data *fdata1, const frame_data *fdata2)
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{
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nstime_t del_dis_ts1, del_dis_ts2;
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frame_delta_abs_time(epan, fdata1, fdata1->prev_dis_num, &del_dis_ts1);
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frame_delta_abs_time(epan, fdata2, fdata2->prev_dis_num, &del_dis_ts2);
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return COMPARE_TS_REAL(del_dis_ts1, del_dis_ts2);
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}
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gint
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frame_data_compare(const struct epan_session *epan, const frame_data *fdata1, const frame_data *fdata2, int field)
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{
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switch (field) {
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case COL_NUMBER:
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return COMPARE_FRAME_NUM();
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case COL_CLS_TIME:
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switch (timestamp_get_type()) {
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case TS_ABSOLUTE:
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case TS_ABSOLUTE_WITH_YMD:
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case TS_ABSOLUTE_WITH_YDOY:
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case TS_UTC:
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case TS_UTC_WITH_YMD:
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case TS_UTC_WITH_YDOY:
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case TS_EPOCH:
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return COMPARE_TS(abs_ts);
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case TS_RELATIVE:
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return frame_data_time_delta_rel_compare(epan, fdata1, fdata2);
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case TS_DELTA:
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return frame_data_time_delta_compare(epan, fdata1, fdata2);
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case TS_DELTA_DIS:
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return frame_data_time_delta_dis_compare(epan, fdata1, fdata2);
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case TS_NOT_SET:
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return 0;
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}
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return 0;
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case COL_ABS_TIME:
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case COL_ABS_YMD_TIME:
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case COL_ABS_YDOY_TIME:
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case COL_UTC_TIME:
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case COL_UTC_YMD_TIME:
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case COL_UTC_YDOY_TIME:
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return COMPARE_TS(abs_ts);
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case COL_REL_TIME:
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return frame_data_time_delta_rel_compare(epan, fdata1, fdata2);
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case COL_DELTA_TIME:
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return frame_data_time_delta_compare(epan, fdata1, fdata2);
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case COL_DELTA_TIME_DIS:
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return frame_data_time_delta_dis_compare(epan, fdata1, fdata2);
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case COL_PACKET_LENGTH:
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return COMPARE_NUM(pkt_len);
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case COL_CUMULATIVE_BYTES:
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return COMPARE_NUM(cum_bytes);
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}
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g_return_val_if_reached(0);
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}
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void
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frame_data_init(frame_data *fdata, guint32 num,
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const struct wtap_pkthdr *phdr, gint64 offset,
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guint32 cum_bytes)
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{
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fdata->pfd = NULL;
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fdata->num = num;
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fdata->pkt_len = phdr->len;
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fdata->cum_bytes = cum_bytes + phdr->len;
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fdata->cap_len = phdr->caplen;
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fdata->file_off = offset;
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fdata->subnum = 0;
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/* To save some memory, we coerce it into a gint16 */
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g_assert(phdr->pkt_encap <= G_MAXINT16);
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fdata->lnk_t = (gint16) phdr->pkt_encap;
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fdata->flags.passed_dfilter = 0;
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fdata->flags.dependent_of_displayed = 0;
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fdata->flags.encoding = PACKET_CHAR_ENC_CHAR_ASCII;
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fdata->flags.visited = 0;
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fdata->flags.marked = 0;
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fdata->flags.ref_time = 0;
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fdata->flags.ignored = 0;
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fdata->flags.has_ts = (phdr->presence_flags & WTAP_HAS_TS) ? 1 : 0;
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fdata->flags.has_phdr_comment = (phdr->opt_comment != NULL);
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fdata->flags.has_user_comment = 0;
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fdata->color_filter = NULL;
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fdata->abs_ts.secs = phdr->ts.secs;
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fdata->abs_ts.nsecs = phdr->ts.nsecs;
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fdata->shift_offset.secs = 0;
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fdata->shift_offset.nsecs = 0;
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fdata->frame_ref_num = 0;
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fdata->prev_dis_num = 0;
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}
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void
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frame_data_set_before_dissect(frame_data *fdata,
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nstime_t *elapsed_time,
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const frame_data **frame_ref,
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const frame_data *prev_dis)
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{
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nstime_t rel_ts;
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/* Don't have the reference frame, set to current */
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if (*frame_ref == NULL)
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*frame_ref = fdata;
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/* if this frames is marked as a reference time frame,
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set reference frame this frame */
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if(fdata->flags.ref_time)
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*frame_ref = fdata;
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/* Get the time elapsed between the first packet and this packet. */
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nstime_delta(&rel_ts, &fdata->abs_ts, &(*frame_ref)->abs_ts);
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/* If it's greater than the current elapsed time, set the elapsed time
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to it (we check for "greater than" so as not to be confused by
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time moving backwards). */
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if ((gint32)elapsed_time->secs < rel_ts.secs
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|| ((gint32)elapsed_time->secs == rel_ts.secs && (gint32)elapsed_time->nsecs < rel_ts.nsecs)) {
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*elapsed_time = rel_ts;
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}
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fdata->frame_ref_num = (*frame_ref != fdata) ? (*frame_ref)->num : 0;
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fdata->prev_dis_num = (prev_dis) ? prev_dis->num : 0;
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}
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void
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frame_data_set_after_dissect(frame_data *fdata,
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guint32 *cum_bytes)
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{
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/* This frame either passed the display filter list or is marked as
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a time reference frame. All time reference frames are displayed
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even if they don't pass the display filter */
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if(fdata->flags.ref_time){
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/* if this was a TIME REF frame we should reset the cul bytes field */
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*cum_bytes = fdata->pkt_len;
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fdata->cum_bytes = *cum_bytes;
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} else {
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/* increase cum_bytes with this packets length */
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*cum_bytes += fdata->pkt_len;
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fdata->cum_bytes = *cum_bytes;
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}
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}
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void
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frame_data_reset(frame_data *fdata)
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{
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fdata->flags.visited = 0;
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if (fdata->pfd) {
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g_slist_free(fdata->pfd);
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fdata->pfd = NULL;
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}
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}
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void
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frame_data_destroy(frame_data *fdata)
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{
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if (fdata->pfd) {
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g_slist_free(fdata->pfd);
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fdata->pfd = NULL;
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}
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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